Yoga and stretching apps are another growing category. Challenges in these apps often focus on flexibility, relaxation, or daily movement routines. A challenge might encourage users to do 10 minutes of stretching every day or complete a month-long yoga plan. These challenges are especially popular with people who want to improve mobility or reduce stiffness from sitting at desks for long hours. They can also be helpful for those who want a gentler form of exercise that still builds strength and balance over time.